The HD re-releases of NiGHTS Into Dreams and Sonic Adventure 2 will release in October, SEGA has announced.
Both games form a part of SEGA's Heritage Collection, and will release on Xbox LIVE Arcade and PlayStation Network following the release of Jet Set Radio later this month.
As well as being given an HD makeover, all three digital releases will include bonus interviews with the developers behind the games.
Specific release dates for NiGHTS and Sonic Adventure 2 have yet to be announced.
The original Sonic Adventure released on Xbox LIVE Arcade and PlayStation Network in September 2010. Martin didn't like it very much, calling it "slow" and "clunky" compared to Sonic's recent HD releases.